book Maths Puzzle Numerical Ability

How do i find the Exterior angle of a regular polygon with 15 sides
i have the choices
a)180
b)12
c)24
d)156
but i found the INTERIOR angle is 156 and then the
Exterior angle should be 204 right

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book Other Question

How many 3 digit counting numbers are even? for what value of theta the expression is real and imaginary.
3+2*sin(theta)/1-2*sin(theta)